基于加速寿命试验的自润滑关节轴承可靠性分析

Reliability Analysis of Self-lubricating Spherical Plain Bearings Based on Accelerated Life Tests

为了实现正常应力下自润滑关节轴承的可靠性评估,利用加速寿命试验的寿命数据及可靠性分析方法,针对自润滑关节轴承的寿命可靠性进行了研究。通过Weibull概率图检验法和F检验法对自润滑关节轴承加速寿命试验中的寿命数据进行分布假设检验,结果显示自润滑关节轴承的寿命服从Weibull分布。采用最佳线性无偏估计法对寿命数据进行参数估计,得到了自润滑关节轴承在不同加速应力下的可靠度、可靠寿命、平均寿命和失效率等可靠性指标。外推出了自润滑关节轴承在正常应力下的寿命可靠度函数,并对其进行了试验验证;验证值与预测值比较接近,表明加速寿命试验是可行的,可以实现正常应力下自润滑关节轴承的可靠性分析。

The reliabilities of self-lubricating spherical plain bearings are investigated with the lifetime data obtained from accelerated life tests and the reliability analysis methods for their reliability assessment under normal stress. Weibull distribution probability graph test method and F test method are used for the hypothesis test of Weibull distribution of lifetime data of self-lubricating spherical plain bearings obtained from accelerated life tests. The results show that the lifetime of self-lubricating spherical plain bearings obeys Weibull distribution. The best linear unbiased estimation method is used to estimate the lifetime data,and the reliability indexes,such as reliability,average lifetime and failure rate,of the self-lubricating spherical plain bearings under different accelerated stresses are obtained. The life reliability function of the self-lubricating spherical plain bearings under normal stress is extrapolated,and the function is verified by test results. It is found that the prediction value is close to the test result,which shows that theaccelerated life tests are feasible,and can be used for the reliability analysis of self-lubricating spherical plain bearings under normal stress.